Let's talk oil

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Wumbo

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Dec 12, 2018
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Illinois
First Name
Rob
Truck Year
1986
Truck Model
C20
Engine Size
454
I'm willing to bet they are.

You can change the intake seals out with a set of GM 3998265 seals to fix the oil consumption problem without machining the valve guides. They are discontinued, but there are a few NOS sets on the 'bay for around 20 bucks.
 

Jerry phillion

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Location
Saginaw, mi.
First Name
Jerry
Truck Year
87
Truck Model
R10
Engine Size
350
I drive my 87 Chevy 350, tbi in the summer months only.
I use Kendal 20/50 . This oil comes with ZDDP( zinc )
already in it. It's their only oil that has zinc in it. Works
Great so far. I only drive it about 1,000 mi per year, so
I only change it every 2years.
 
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